Fig. 2.

a) Map of the Australian IMOS Acoustic Tracking network during the COVID-19 pandemic in relation to population density and difference in vessel traffic between 2019 and 2020. Blue and yellow circles indicate the location of IMOS and researcher-owned acoustic tracking receivers, respectively. b) Changes in Automatic Identification System vessel detections within 8 km of receivers in the IMOS Animal Tracking network between January–June 2019 and 2020. Information is provided for the top six vessel classes and other classes. c) Map of North Neptune Islands, in South Australia, where white shark (Carcharodon carcharias) cage-diving tourism takes place. Yellow dots represent location of acoustic receivers; coloured raster cells show the 2019 distribution of cage-diving operators anchoring locations. (For interpretation of the references to colour in this figure legend, the reader is referred to the web version of this article.)